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Zooming through low-Earth orbit at 17,500 mph (28,162 kph), Suni Williams completes the standard marathon distance every 5.4 seconds.
But for next month's Boston Marathon, the U.S. Navy commander will run the equivalent distance on a treadmill - 210 miles (338 kilometers) above Earth in the international space station, and tethered to her track by bungee cords so she does not float away.
"She thought it would be cool if she gave it a try," said Williams' sister, Dina Pandya, who will run the race the traditional way with almost 24,000 other runners. "She said, 'I'll call you on Heartbreak Hill."'